Eleanor de Montfort

Eleanor de Montfort (1252-19 June 1282) was the wife of King Llywelyn the Last of Gwynedd and the last Princess of Wales before the conquest of Wales by the Kingdom of England. She was a member of the House of Montfort, and she was the daughter of Simon V de Montfort.

Biography
Eleanor de Montfort was born in 1252 to the House of Montfort, being the daughter of Simon V de Montfort and Eleanor of England; she was the granddaughter of John of England and Isabella of Angouleme and the niece of Henry III of England and Richard of Germany. She was only thirteen when her father was killed at the Battle of Evesham in the Second Barons' War, and in 1275 she married King Llywelyn the Last of Gwynedd, an ally of her late father. While she was headed north through England to meet her husband, having married him by proxy, she was captured on the orders of King Edward I of England due to the state of war between England and Wales and was imprisoned until 1278 in the Tower of London. She died in 1282 while giving birth to Gwenllian of Wales, a daughter.